As I stated a few pages back, the problem with the Falcon docking matte is that it is not fully a painting. As Ellenshaw stated in his interview with Rinzler, he painted around a still of the model. You can see this painting, the one that was actually used, in the Art of Star Wars book - it's the hangar, and the *edges* of the Falcon.
You'd need a high-res film frame. The closest thing I know of is that screencap from the Senator screening, the one on zombie's site, and aren't you using that as one of the elements in your current composite?
Anybody got a 70mm frame of the hangar shot? :)